Sep 13 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesFabrication and Heat Treatment Machinability Welding Heat Treatment
Introduction
Pure copper has good electrical and thermal conductivity. More than 400 varieties of copper alloys are available. Alloys can be freely formed by copper than by most metals.
The following datasheet gives an overview of UNS C81500 copper alloy.
Chemical Composition
The chemical composition of UNS C81500 copper alloy is given in the following table.
| Element |
Content (%) |
| Cu |
98 (min) |
| Cr |
1 |
| others |
0.50 (max) |
Physical Properties
The physical properties of UNS C81500 copper alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Density |
8.82 g/cm3 |
0.319 lb/in³ |
Mechanical Properties
The following table shows mechanical properties of UNS C81500 copper alloy.
| Properties |
Metric |
Imperial |
| Hardness, Brinell |
105 |
105 |
| Tensile strength |
350 MPa |
50800 psi |
| Yield strength |
275 MPa |
39900 psi |
| Elongation at break ( in 50 mm) |
17% |
17% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson’s ratio |
0.34 |
0.34 |
| Charpy impact ( V-notch) |
27 J |
19.9 ft-lb |
| Izod impact |
41 J |
30.2 ft-lb |
| Fatigue strength (@# of cycles 1.00e+8) |
105 MPa |
15200 psi |
| UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
| Shear modulus |
44 GPa |
6380 ksi |
Thermal Properties
The thermal properties of UNS C81500 copper alloy are outlined in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@ 20-300°C/68-572°F) |
17.1 µm/m°C |
9.50 µin/in°F |
| Thermal conductivity (@ 20°C/68°F) |
315 W/mK |
2190 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Machinability
The machinability rating of UNS C81500 copper alloy is 20.
Welding
UNS C81500 copper alloy can be welded using brazing, soldering, gas shielded arc welding, and carbon arc welding techniques. Oxyacetylene welding, and coated metal arc welding techniques are not suitable for welding this alloy.
Heat Treatment
UNS C81500 copper alloy can be stress relieved at 280°C (500°F). The time taken for stress relieving is about 1 hr/ in. of section thickness. Heat treating temperatures of this alloy are 1000 to 1010°C (1830 to 1850°F). It does not respond to heat treatment. The time taken for heat treating is also about 1 hr/ in. of section thickness. It can be quenched in water. The precipitation hardening temperatures of this alloy are 482°C (900°F), and time taken for precipitation hardening is about 3 h. Air is a quenching medium used in precipitation hardening process.